Support wildcard handling in emit()

Change `emit()` to call handlers registered for parent classes using
`isinstance()`. Ensures that base event handlers receive derived
events.

tests/utilities/events/test_crewai_event_bus.py

@@ -0,0 +1,40 @@
+from unittest.mock import Mock
+
+import pytest
+
+from crewai.utilities.events.base_events import CrewEvent
+from crewai.utilities.events.crewai_event_bus import CrewAIEventsBus
+
+
+class TestEvent(CrewEvent):
+    pass
+
+@pytest.fixture
+def event_bus():
+    bus = CrewAIEventsBus()
+    bus.clear_handlers()
+    return bus
+
+def test_specific_event_handler(event_bus):
+    mock_handler = Mock()
+
+    @event_bus.on(TestEvent)
+    def handler(source, event):
+        mock_handler(source, event)
+
+    event = TestEvent(type="test_event")
+    event_bus.emit("source_object", event)
+
+    mock_handler.assert_called_once_with("source_object", event)
+
+def test_wildcard_event_handler(event_bus):
+    mock_handler = Mock()
+
+    @event_bus.on(CrewEvent)
+    def handler(source, event):
+        mock_handler(source, event)
+
+    event = TestEvent(type="test_event")
+    event_bus.emit("source_object", event)
+
+    mock_handler.assert_called_once_with("source_object", event)